Efficacy of Tissue Tolerable Plasma (TTP) against Ixodes ricinus

dgkh000224 10.3205/dgkh000224 urn:nbn:de:0183-dgkh0002246 Research Article Efficacy of Tissue Tolerable Plasma (TTP) against Ixodes ricinus Wirksamkeit von Tissue Tolerable Plasma (TTP) gegen Ixodes ricinus Bender Bender Claudia C Dr. rer. med.

Institute of Hygiene and Environmental Medicine, University Medicine Greifswald, Walther-Rathenau-Str. 49 a, 17489 Greifswald, Germany, Phone: +49-(0)3834-515542, Fax: +49-(0)3834-515541Institute of Hygiene and Environmental Medicine, University Medicine, Greifswald, Germany

bender@tierarztpraxis-karrin.de author Kramer Kramer Axel A Prof. Dr. med.

Institute of Hygiene and Environmental Medicine, University Medicine, Greifswald, Germany

kramer@uni-greifswald.de author German Medical Science GMS Publishing House

Düsseldorf

610 Tissue Tolerable Plasma TTP argon plasma KINPen09 acaricidal efficacy Tissue Tolerable Plasma TTP Argonplasma KINPen09 acarizide Wirkung 20140307 engl 2196-5226 9 1 GMS Hygiene and Infection Control GMS Hyg Infect Control 04 BMBF Da Tissue Tolerable Plasma (TTP) gegen bestimmte Milbenarten wirksam ist, sollte die Wirksamkeit gegen Zecken untersucht werden.Die Untersuchungen wurden mit dem KINPen09 (Trägergas Argon) an Ixodes ricinus (n=24) durchgeführt. Behandlungszeiten von 1 und 3 min führten zu einer reversiblen Inaktivierung. Nach 5 min waren die Zecken irreversibel abgetötet.Auf Grund der acariziden Wirkung von TTP eröffnet sich eine neue Behandlungsstrategie für von Zecken befallene Haustiere mit dem KINPen09. The efficacy of Tissue Tolerable Plasma (TTP) against ticks was tested, as data from the literature has demonstrated its efficacy against other acari.The study was carried out by using the KINPen09 (Argon as carrier gas) on Ixodes ricinus (n=24). Treatment times of 1 and 3 minutes led to a reversible inactivation of the ticks. After 5 min of treatment, they died.Thanks to the acaricidal effect of TPP, a new treatment strategy using the KINPen09 for tick-infested pets is now available. IntroductionIt was shown that Tissue Tolerable Plasma (TTP) generated by the KINPen09 was able to inactivate and/or kill the human-relevant parasite Demodex follicularum, which belongs to the subclass of acari . Therefore, testing the efficacy of TTP against ticks on their main representative Ixodes ricinus is justifiable, because ticks are characterized by their broad range of hosts and they are responsible for the transmission of several infectious diseases, such as the animal and human pathogens causing Lyme disease, ehrlichiosis, and babesiosis. The inactivation of ticks by plasma is convenient, where mechanical removal is often problematic in cases of difficult access to certain anatomic structures, e.g., the auditory canal or interdigital space of dogs or cats, or if the tick is too small to be pulled out with tweezers etc. In the latter case, one should not wait for the tick to enlarge by aspiring enough to blood to be seized, because it is likely that the transmission of pathogens increases with time. Materials and methodsFor the study, 24 vital sheep ticks (Ixodes ricinus) in different stages of aspiration were mechanically removed from cats and dogs by twisting the ticks out after fixation with plastic forceps.The KINPen09 was used as the plasma source . The argon (Ar) gas flow was set to 5 slm (standard liters per minute). The application times were 1 min, 3 min and 5 min</PlainText></TextGroup>. To apply the plasma, the visible tip of the plasma jet was placed at the tick’s chelicerae (mouthparts).</Pgraph><Pgraph>The observation period for all ticks was 5–7 days. The endpoint of observation was determined as fetor of beginning decay or visible shrinkage as a sign of desiccation. Both criteria were considered as signs of the tick’s death.</Pgraph></TextBlock> <TextBlock linked="yes" name="Results"> <MainHeadline>Results</MainHeadline><Pgraph>A treatment time of 1 min led to a reversible inactivation of the ticks (n=6). After initial immobilization, however, the ticks resumed motility after 0.5 to 5 h. A post-treatment of another 3 min led to a constant immobilized state.</Pgraph><Pgraph>An initial treatment time of 3 min led to persistant inactivation for some of the ticks (n=5). However, other ticks (n=4) became mobile again within 24 h.</Pgraph><Pgraph>A treatment time of 5 min led to persistant inactivation of all ticks (n=9) within the observation period.</Pgraph></TextBlock> <TextBlock linked="yes" name="Discussion"> <MainHeadline>Discussion</MainHeadline><Pgraph>With the KINPen09, an irreversible inactivation of <Mark2>Ixodes ricinus</Mark2> was reached with a treatment time of 5 min. Even if the host’s adjacent skin is accidentally exposed to the plasma, there is no risk of damage, because the much more sensitive chorioallantois membrane of a fertilized, incubated chicken egg tolerates the same plasma source up to 40 s <TextLink reference="3"></TextLink>, <TextLink reference="4"></TextLink>. Furthermore, the treatment of chronic wounds with the KINPen09 <TextLink reference="5"></TextLink>, <TextLink reference="6"></TextLink> has been shown to be successful until complete healing is attained, without any side effects <TextLink reference="7"></TextLink>.</Pgraph></TextBlock> <TextBlock linked="yes" name="Conclusion"> <MainHeadline>Conclusion</MainHeadline><Pgraph>The results demonstrate the acaricidal effect of plasma and introduce a whole new treatment strategy for tick-infested pets. </Pgraph></TextBlock> <TextBlock linked="yes" name="Notes"> <MainHeadline>Notes</MainHeadline><SubHeadline>Competing interests</SubHeadline><Pgraph>The authors declare that they have no competing interests.</Pgraph><SubHeadline>Acknowledgements</SubHeadline><Pgraph>This work was realized within the framework of the multidisciplinary research cooperation “Campus PlasmaMed”, particularly within the project “PlasmaDent”. 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